Communication is a critical factor in any organization. The choices Air Force members make when communicating have a direct impact on mission accomplishment. Media Richness Theory (MRT) recognizes that communication needs, and the ability of various media to support them, are influenced by a number of factors involving the message content, situational elements, and its symbolic aspects. The theory predicts employees who use more appropriate communication media - face-to-face conversation, telephone, e-mail, and written correspondence - as predicted by the theory, will be more effective performers. The ability of MRT to explain supervisory performance ratings for a group of junior enlisted Air Force members (n=48) and another group of senior enlisted Air Force members (n=35) was tested. Results showed that junior enlisted members who made media choices more consistent with MRT were rated as more effective performers by their supervisors. This is consistent with the findings of previous studies.